System and process for separating multi phase mixtures using three phase centrifuge and fuzzy logic
First Claim
1. A system for separating a multi phase mixture comprising:
- a centrifuge configured to separate the mixture into a first liquid phase component, a second liquid phase component and a solid phase component; and
a control system programmed with a set of fuzzy logic rules;
the control system configured to sense feed variables of the mixture into the centrifuge and at least one parameter of the first liquid phase component or the second liquid phase component and to adjust a feed temperature and a feed rate of the mixture based on the variables, the parameter and the set of fuzzy logic rules.
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Abstract
A system for separating a multi phase mixture into a first liquid phase component, a second liquid phase component and a solid phase component includes a three phase centrifuge and a control system for the centrifuge. The control system includes a fuzzy soft sensor programmed with fuzzy logic rules and a feed forward controller in signal communication with the fuzzy soft sensor. The feed forward controller is configured to adjust a feed rate and a feed temperature of the mixture based on the rules, the cold feed temperature, the percent change of water in the mixture, and the percent change of solids in the mixture. The system also includes a feedback controller configured to adjust the feed rate and the feed temperature of the mixture based on the rules, and the basic water and solid (BS&W) content of the first liquid phase component.
51 Citations
29 Claims
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1. A system for separating a multi phase mixture comprising:
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a centrifuge configured to separate the mixture into a first liquid phase component, a second liquid phase component and a solid phase component; and
a control system programmed with a set of fuzzy logic rules;
the control system configured to sense feed variables of the mixture into the centrifuge and at least one parameter of the first liquid phase component or the second liquid phase component and to adjust a feed temperature and a feed rate of the mixture based on the variables, the parameter and the set of fuzzy logic rules. - View Dependent Claims (2, 3, 4)
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5. A system for separating a multi phase mixture comprising:
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a centrifuge configured to separate the mixture into a first liquid phase component, a second liquid phase component and a solid phase component;
a feed forward control system comprising a plurality of sensors, a fuzzy soft sensor in signal communication with the sensors programmed with a set of fuzzy logic rules, and a controller in signal communication with the fuzzy soft sensor, the feed forward control system configured to sense feed variables of the mixture into the centrifuge and to adjust a feed temperature and a feed rate of the mixture based on the feed variables and the set of fuzzy logic rules; and
a feedback control system configured to measure feedback variables in the first liquid phase component or the second liquid phase component and to adjust the feed temperature and the feed rate based on the feedback variables and the set of fuzzy logic rules;
the feedback control system comprising a feedback controller including a conflict resolution portion configured to coordinate the operation of the controller and the feedback controller. - View Dependent Claims (6, 7, 8)
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9. A system for separating a multi phase mixture comprising:
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a centrifuge configured to separate the mixture into a first liquid phase component, a second liquid phase component and a solid phase component;
a feed forward control system comprising a plurality of sensors, a fuzzy soft sensor in signal communication with the sensors programmed with a set of fuzzy logic rules, and a controller in signal communication with the fuzzy soft sensor, the feed forward control system configured to sense feed variables of the mixture into the centrifuge and to adjust a feed temperature and a feed rate of the mixture based on the feed variables and the set of fuzzy logic rules; and
a filter in signal communication with the fuzzy soft sensor configured to differentiate signals representative of the feed variables from noise. - View Dependent Claims (10, 11)
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12. A system for separating a multi phase mixture comprising:
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a centrifuge configured to separate the mixture into a first liquid phase component, a second liquid phase component and a solid phase component;
a heater configured to heat the mixture to a temperature set point (T2);
a pump configured to pump the mixture into the centrifuge;
a fuzzy soft sensor in signal communication with a first sensor configured to sense a feed temperature (T1) of the mixture and a second sensor configured to sense a basic solids and water content of the mixture;
a set of fuzzy logic rules programmed into the fuzzy soft sensor and configured to express input from the first sensor and the second sensor into at least one feed change variable; and
a controller in signal communication with the fuzzy soft sensor configured to adjust the temperature set point (T2) for the mixture, and to adjust a speed of the pump to achieve a selected feed rate for the mixture. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A process for separating a multi phase mixture comprising:
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providing a centrifuge configured to separate the mixture into a first liquid phase component, a second liquid phase component and a solid phase component; and
providing a fuzzy soft sensor programmed with a set of fuzzy logic rules;
sensing at least one feed variable of the mixture and at least one parameter of the first liquid chase component or the second liquid phase component; and
adjusting a feed temperature and a feed rate of the mixture into the centrifuge based on the feed variable, the parameter and the set of fuzzy logic rules. - View Dependent Claims (20, 21, 22, 23)
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24. A process for separating a multi phase mixture comprising:
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providing a centrifuge configured to separate the mixture into a first liquid phase component, a second liquid phase component and a solid phase component;
providing a feed pump configured to pump the mixture into the centrifuge at a feed rate;
providing a heater configured to heat the mixture to a temperature set point;
providing a fuzzy soft sensor programmed with a set of fuzzy logic rules that relate a feed water composition change of the mixture, a feed solid composition change of the mixture, and a cold feed temperature change of the mixture to a feed pump speed change for the feed pump, and to a heater setpoint change for the heater;
sensing the basic solids and water content of the mixture and the cold feed temperature;
filtering signals representative of the basic solids and water content and the cold feed temperature from noise;
relating the basic solids and water content to the feed water composition change and to the feed solid composition change; and
adjusting the feed rate and the temperature set point using the rules, the sensing step, the filtering step and the relating step. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification